Drill-chuck.



2 SHEETS-SHEET 1.

PATENTED JULY 14, 1908.

A. P. MORROW,

DRILL GHUCK.

APPLICATION FILED OCT. 24,1907.

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aw/thy sea No. 898,348. PATENTED JULY 1 1, 1908. A P. MGRROW.

DRILL. CHUCK.

APPLICATION FILED 00:17. 24.1907.

2 SHEETS-SHEET 2 lowing to be a full, clear, and exact descrip same; lig. 2-3 is' a v collective view in side assembled parts of a clutchembodying ALEXANDER P; MURROW,

Ol ELMIRA, NEW YORK.

DRILL-CHUCK.

no. ceases.

To all whom it may concern:

Be it known that l, ALEXANDER P. Mon- ROW, a citizen of the UnitedStates, residing at Eln'iira, in the county of Cheniung and State ol'New Yora, have invented certeiil new and useful Improvements in Drill-Chuclilh and I do hereby declare the follion oi the invention, such aswill enable others Slill ed in the art to which it appce tains to makeand use the some.

This invention relates to chucks, and more particularly to that class ofdevices in which tubular shell or case is employed having a rcvolublehead therein engaging gripping jaws which are slidably mounted u )011 orwithin the case and adapted to be advanced by the rotation of the headso .is' to grip an article. and to release their grip and rcccde intothe case when the direction of rotation of the head is reversed.

The objects of the invention. are to pro duce an ell'icient, durable andinexpensive chuck of the character referred to consisting of few partswhich may be easily assembled or taken apart, and to rovidc anantil'ric'tion bearing externa to the headadapted to sustain end-thrustand hold the head and case together, ainliurtbcr, todispensc with theusual screw-threaded connection between the revoluble head and case orshell and thus avoid the trouble and inconvenience resulting from injuryto the threads upon the head, whichfrequently occurs when the head ismade to project beyond the case in unscrewing the same so i liciriitl toadvance or retract the gripping jaws.

The invention will first be hereinafter particularly described, withreference to the accornpsnyinp; drawings, which are to be taken as apart of this specification, and then pointed out in the, claims at theend of the description.

111 said drawii igrs, Figure i represents a perspective *iew with, partsbroken away of a clutch embodying ny invention; Fig. 2' is alongitudinal sectional elevation of the elefinmy invention, end Fig. 4is a transverse section, taken on the line 4----4 of Fig. 2, looking inthe direction of the arrow.

ltcfcrring to the drawings, in which corvation, partly in s ction, ofthe several Specification of Letters Fa'tent.

Application filed October 2%, 1907.

rcspi'inding parts are d noted by similar Patented July 14-, 1908.

tierial No. 899,052.

letters in different views, the letter A may denote a tubular body orcase having it frusto-conical section a, which is slot-ted lengthwise to)rovide suitable guides for a series of jaws which are slidebly fittedin said slots. d/ithin the case is lilted a revoluble heed C, having asection 0 sci-rived into its inner end, so that when rotated, (the innersection 0 being stationary) the screw-threadcd connection will cause theinner section to either advance or recede into the main body C of thehead, according to the direction of rotation, therebvedvaneing; orretracting the jaws with which said section C is connected.

The periphery of the head (I is smooth, or I without screw-threads, andadapted to fit a correspondingly smooth bore of thetubuhtr body orcasing, and these two partsnre connected together in such manner as topermit free rotation one upon or Within the other, While preventinendwise movement or separation thereof, by means of an antifrictionbearing which, in the form shown, consists of a of balls E running in anannular groove c in the periphery of the head anda correspomling groovee on the inner side of the tubular body or case, the latter groove beingformed partly in the main portion or body of the case and )artly in adetachable section or nut A, which may be screwed into an interiorlytln-cnded'recessed end ol' the case, as. shown in Fig. 2 of thedrawings. As will be seen, the sec tion U of the head is formed orprovided With, preferably, dovetail grooves or recesses 0, adapted toreceive correspoiulingly shaped tenons l), on the sliding jaws B, whichlatter are fitted in the slots of the 'l'rusto-conicel portion of thecase and are provided with marginal ribs l), engaging; recesses 11/which extend along the mergins of said slots, so that jawsare supportedby said marginel ribs Within the slots, and are confined therein againstradial movement by means of n sleeve D, having a frusto-conical portiond, which overlies the frusto-conical portion of the case; said sleevebeing screwed upon the case, as shown, or otherwise secured thereto.ltotetion of the case independently of the section C of the head isprevented, While'lon itudinal movement of the letter is perinittec, forthe purpose of advancing or Withdrawing the gripping jaws, by thedescribed connection between. said parts. For greater strength externallugs or projections 0 may and security against independent rotation ofthe reciprocating section Cot the heegl,

6 formed on its peripherydirectly in the rear of the dovetail slotstherein, so as to engage the longitudinal slots in the frustoconicelsection of the case. Said lugs may also scrvens :in abutment or stop--to limit the rearward movement of the section C within the head.

Exterior milled surfaces of the cese and sleeve may be provided, asshown, to afford a firmer hold upon said parts when it is desired tounscrew them, or for the purpose of rotating the case upon thecenterpiece or head, or vice verse, when it is desired to edvzrnce orretract the jaws. The centerpiece or h id is recessed as usual toreceive it tool or shank F, by which rotary movement may be impartedto-the heed while the tubular case is held stationery.

In operation, rotation of the head in one direction will graduallyadvance the gripping jews, cruising them to move Without rotating alongthe inclined surface of the frusto-conicel portion oi the case, asindicated in Fig. 2, until they firmly grip the shank of a tool or otherarticle, and by a reverse movement of thehead the jaws will be retractedorceused to rccede into' the irusto-conicel portion of the case intheususrl manner, but by reeson of the anti-friction bearing, whichtelres the end-thrust and permits free and easy ro-- tetion, the desiredresults are accomplished without the exertion and Wear and tear incidentto using chucks of a similar character as heretofore constructed, andthere are no screw-threads on the heed to be exposed out side of thecasing, with consequent liability to inpiry, Wlnle the threadedconnection be I tween the telescopic sections or the head is protectedby being inclosed ithin the case, all of which contribute to the generalefficiency and durability of the device.

It will be understood, of course, that verious changes might be made inthe details and arrangement of parts Without departing from the spiritand scope of my invention,

and hence 1 do not desire to be restricted to the specific constructionand arrangement shown and described.

Having thus described my'invention What I claim as new and desire tosecure by Letters Patent of the UnitedStates is:

1, in a chuck, it revoluble case and jaws adapted to be operatedthereby, in combination with a. head within the case having a smoothcylindrical exterior, there being an annular race-Wavy between the caseand head, and entidrictiondevices in said rece- Wey serving the doublepurpose of a bearing and a key to prevent end movement.

In a chuck, a 'revoluble case having a conical section With slotsextending longitudinally thereofnnd jaws slidebly engaged with saidslots, in combination with an internally threaded head having anexternally threaded section screwed therein, said section beingconnected with said jaws so that they are moved. longitudinally andradially by rotation of the case or head, and projections on saidthreaded section engaging the slots in the case for cooperative actionin preventing independent rotation and to lin'iitreerwerd movementofseid threaded section, I

In testimony whereof I afiix my signature in presence of two Witnesses.

' ALEXANDER P. MORROVV.

/Vitnesses: i

ROB RT V. R. BASSETT, Eunice B. W EST.

